Entry 1 sense Webster, 1913 Catamenial /(kăt`ȧ*mē"nĭ*al)/ · Cat·a·me·ni·al · IPA /kæ.təˈmi.nɪ.əl/ 01 a. Pertaining to the catamenia, or menstrual discharges. 1. Pertaining to the catamenia, or menstrual discharges.